arch/h8300/platform/h8300h/irq.c

   1 /*
   2  * Interrupt handling H8/300H depend.
   3  * Yoshinori Sato <ysato@users.sourceforge.jp>
   4  *
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/errno.h>
   9
  10 #include <asm/ptrace.h>
  11 #include <asm/traps.h>
  12 #include <asm/irq.h>
  13 #include <asm/io.h>
  14 #include <asm/gpio.h>
  15 #include <asm/regs306x.h>
  16
  17 const int __initdata h8300_saved_vectors[] = {
  18 #if defined(CONFIG_GDB_DEBUG)
  19         TRAP3_VEC,      /* TRAPA #3 is GDB breakpoint */
  20 #endif
  21         -1,
  22 };
  23
  24 const h8300_vector __initdata h8300_trap_table[] = {
  25         0, 0, 0, 0, 0, 0, 0, 0,
  26         system_call,
  27         0,
  28         0,
  29         trace_break,
  30 };
  31
  32 int h8300_enable_irq_pin(unsigned int irq)
  33 {
  34         int bitmask;
  35         if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
  36                 return 0;
  37
  38         /* initialize IRQ pin */
  39         bitmask = 1 << (irq - EXT_IRQ0);
  40         switch(irq) {
  41         case EXT_IRQ0:
  42         case EXT_IRQ1:
  43         case EXT_IRQ2:
  44         case EXT_IRQ3:
  45                 if (H8300_GPIO_RESERVE(H8300_GPIO_P8, bitmask) == 0)
  46                         return -EBUSY;
  47                 H8300_GPIO_DDR(H8300_GPIO_P8, bitmask, H8300_GPIO_INPUT);
  48                 break;
  49         case EXT_IRQ4:
  50         case EXT_IRQ5:
  51                 if (H8300_GPIO_RESERVE(H8300_GPIO_P9, bitmask) == 0)
  52                         return -EBUSY;
  53                 H8300_GPIO_DDR(H8300_GPIO_P9, bitmask, H8300_GPIO_INPUT);
  54                 break;
  55         }
  56
  57         return 0;
  58 }
  59
  60 void h8300_disable_irq_pin(unsigned int irq)
  61 {
  62         int bitmask;
  63         if (irq < EXT_IRQ0 || irq > EXT_IRQ5)
  64                 return;
  65
  66         /* disable interrupt & release IRQ pin */
  67         bitmask = 1 << (irq - EXT_IRQ0);
  68         switch(irq) {
  69         case EXT_IRQ0:
  70         case EXT_IRQ1:
  71         case EXT_IRQ2:
  72         case EXT_IRQ3:
  73                 *(volatile unsigned char *)IER &= ~bitmask;
  74                 H8300_GPIO_FREE(H8300_GPIO_P8, bitmask);
  75                 break ;
  76         case EXT_IRQ4:
  77         case EXT_IRQ5:
  78                 *(volatile unsigned char *)IER &= ~bitmask;
  79                 H8300_GPIO_FREE(H8300_GPIO_P9, bitmask);
  80                 break;
  81         }
  82 }